Synthesis and magnetic transitions of rare-earth-free Fe–Mn–Ni–Si-based compositionally complex alloys at bulk and nanoscale

• Shabbir Tahir,
• Tatiana Smoliarova,
• Carlos Doñate-Buendía,
• Michael Farle,
• Natalia Shkodich and
• Bilal Gökce

Beilstein J. Nanotechnol. 2025, 16, 823–836, doi:10.3762/bjnano.16.62

• applications such as magnetic hyperthermia, where NPs are used in cancer therapy to induce localized heating when exposed to an alternating magnetic field [34]. However, producing CCAs at the nanoscale presents significant challenges. Traditional wet chemistry approaches often fail because of elemental

• FC curve shows higher magnetization than the ZFC curve, indicating that spin alignment occurs faster when cooled in the presence of a magnetic field because of the pre-alignment that the magnetic field produces. Above 179 K, the ZFC and FC curves converge, suggesting that thermal energy disrupts

• in the presence of a magnetic field. The M–H curve (Figure 7d and Figure S6d, Supporting Information File 1) of the Al-based CCA at 5 K shows significant hysteresis, with a Hc of 16.6 kA·m−1, which is higher than that of the bulk Al-based CCA (11 kA·m−1). The increase in Hc in the NPs is likely due

Morphology and properties of pyrite nanoparticles obtained by pulsed laser ablation in liquid and thin films for photodetection

• Akshana Parameswaran Sreekala,
• Bindu Krishnan,
• Rene Fabian Cienfuegos Pelaes,
• David Avellaneda Avellaneda,
• Josué Amílcar Aguilar-Martínez and
• Sadasivan Shaji

Beilstein J. Nanotechnol. 2025, 16, 785–805, doi:10.3762/bjnano.16.60

• of a magnetic field by laser ablation in liquids. SEM and TEM images of FeS2 nanoparticles prepared without a magnetic field revealed spherical particles with varying sizes, aggregation and agglomeration with an average size of approximately 40 nm [38]. In contrast to this, the average particle sizes

• phase-pure FeS2. A photodetector with detectivity of around 108 Jones was reported [68]. Mohsin et al. reported an external magnetic field-assisted laser ablation in liquid technique to prepare FeS2 nanoparticles [38]. They reported fabrication of FeS2 NPs/p-Si photodetectors using dipping technique

Changes of structural, magnetic and spectroscopic properties of microencapsulated iron sucrose nanoparticles in saline

• Sabina Lewińska,
• Pavlo Aleshkevych,
• Roman Minikayev,
• Anna Bajorek,
• Mateusz Dulski,
• Krystian Prusik,
• Tomasz Wojciechowski and
• Anna Ślawska-Waniewska

Beilstein J. Nanotechnol. 2025, 16, 762–784, doi:10.3762/bjnano.16.59

• the considered temperature range. Increasing the magnetic field to 10 kOe did not significantly change the position of TMAX (see inset of Figure 5b), and the shape of the ZFC–FC relation. Only the magnetic field above 10 kOe shifts the ZFC maximum to lower temperatures; however, even at 60 kOe, the

• full reversibility of the ZFC and FC curves is not achieved (Figure 5b). The so-called irreversibility temperature, TIRR, at which the ZFC and FC curves bifurcate, is very little dependent on the magnetic field and is around 65 K for all registered temperature relations. It should be also stressed that

• in the M(T) relations there is no trace of the Verway transition (TV ≈ 125 K) typical for Fe3O4. Figure 5c presents the temperature dependences of the real part of the magnetic susceptibility, χ’(T), registered at several frequencies f of an ac external magnetic field for FS0. (In Figure 5c only

High-temperature epitaxial growth of tantalum nitride thin films on MgO: structural evolution and potential for SQUID applications

• Michelle Cedillo Rosillo,
• Oscar Contreras López,
• Jesús Antonio Díaz,
• Agustín Conde Gallardo and
• Harvi A. Castillo Cuero

Beilstein J. Nanotechnol. 2025, 16, 690–699, doi:10.3762/bjnano.16.53

• critical temperature of 6.3 K. In materials with superconducting properties, any variation of an external magnetic field induces electric currents on the surface that counteract this variation. This unique property enables the materials to detect very weak magnetic fields. This principle is leveraged in

Performance optimization of a microwave-coupled plasma-based ultralow-energy ECR ion source for silicon nanostructuring

• Joy Mukherjee,
• Safiul Alam Mollick,
• Tanmoy Basu and
• Tapobrata Som

Beilstein J. Nanotechnol. 2025, 16, 484–494, doi:10.3762/bjnano.16.37

• a strong electric field generated in the cavity, the ECR-based ion sources equipped with microwave cavities neither contain any filament nor any type of electrode [26]. The high plasma density within a quartz cup is confined by solenoid magnets surrounding it, creating a multi-cusp magnetic field

• . However, careful attention is required for the microwave coupling to the plasma cup to minimize the reflections of microwave power. Mechanical adjustments to the resonator length and waveguide are made to ensure minimal reflection. Additionally, maintaining the necessary magnetic field strength is crucial

Vortex lattices of layered HTSCs at different vortex–vortex interaction potentials

• Valerii P. Lenkov,
• Anastasia N. Maksimova,
• Anna N. Moroz and
• Vladimir A. Kashurnikov

Beilstein J. Nanotechnol. 2025, 16, 362–370, doi:10.3762/bjnano.16.27

• ; Introduction Type-II superconductors, as shown by numerous studies, have a complex phase diagram in a magnetic field. In fields greater than the first critical field Hc1 and less than the second critical field Hc2, at temperatures below the critical temperature the superconductor is in a mixed state, in which

• the magnetic field penetrates the superconductor in the form of Abrikosov vortices [1]. In high-temperature superconductors (HTSCs), such as Y- and Bi-based cuprates, the vortex lattice is further complicated since these compounds have a layered structure [2][3][4][5][6]. The vortex filament in these

• discovered. Indications were also obtained that the second peak on the magnetization curve (second magnetization peak) at low temperature (less than 0.55Tc) coincides with the transition between the regimes of the flow of the vortex lattice. The measurements were also performed in a magnetic field inclined

Theoretical study of the electronic and optical properties of a composite formed by the zeolite NaA and a magnetite cluster

• Joel Antúnez-García,
• Roberto Núñez-González,
• Vitalii Petranovskii,
• H’Linh Hmok,
• Armando Reyes-Serrato,
• Fabian N. Murrieta-Rico,
• Mufei Xiao and
• Jonathan Zamora

Beilstein J. Nanotechnol. 2025, 16, 44–53, doi:10.3762/bjnano.16.5

• introduction of magnetic nanoparticles into zeolite crystals so that the resulting composite can respond to an external magnetic field [33]. By imparting magnetic properties to such composites, they can be efficiently recovered after capturing contaminants such as heavy metals [34][35][36][37] and dyes [38][39

New design of operational MEMS bridges for measurements of properties of FEBID-based nanostructures

• Bartosz Pruchnik,
• Krzysztof Kwoka,
• Ewelina Gacka,
• Dominik Badura,
• Piotr Kunicki,
• Andrzej Sierakowski,
• Paweł Janus,
• Tomasz Piasecki and
• Teodor Gotszalk

Beilstein J. Nanotechnol. 2024, 15, 1273–1282, doi:10.3762/bjnano.15.103

• [38], but this technique is difficult to apply in SEM chambers (the ultimate working environment for opMEMS) because of the difficulty of obtaining a controlled magnetic field inside. In the experiments, the resonance of the opMEMS was measured outside the vacuum chamber using a SIOS nano vibration

The role of a tantalum interlayer in enhancing the properties of Fe₃O₄ thin films

• Hai Dang Ngo,
• Vo Doan Thanh Truong,
• Van Qui Le,
• Hoai Phuong Pham and
• Thi Kim Hang Pham

Beilstein J. Nanotechnol. 2024, 15, 1253–1259, doi:10.3762/bjnano.15.101

• SiO2, MgO(100) and MgO/Ta/SiO2, respectively. Magnetization of Fe3O4 samples in an external magnetic field in a range of (a) −10 kOe to 10 kOe and (b) −2 kOe to 2 kOe. Surface properties obtained from the AFM scans of Fe3O4 samples. Structural parameters of Fe3O4 thin films on various substrates

A review on the structural characterization of nanomaterials for nano-QSAR models

• Salvador Moncho,
• Eva Serrano-Candelas,
• Jesús Vicente de Julián-Ortiz and
• Rafael Gozalbes

Beilstein J. Nanotechnol. 2024, 15, 854–866, doi:10.3762/bjnano.15.71

• found to be used as NM descriptors, such as the relaxivities R1 and R2 obtained from magnetic resonance studies [44]. Related to magnetism, Kotzabasaki et al. used the magnetic field strength, but also a single categorical descriptor describing the magnetic core composition of the nanoparticles [25

Radiofrequency enhances drug release from responsive nanoflowers for hepatocellular carcinoma therapy

• Yanyan Wen,
• Ningning Song,
• Yueyou Peng,
• Weiwei Wu,
• Qixiong Lin,
• Minjie Cui,
• Rongrong Li,
• Qiufeng Yu,
• Sixue Wu,
• Yongkang Liang,
• Wei Tian and
• Yanfeng Meng

Beilstein J. Nanotechnol. 2024, 15, 569–579, doi:10.3762/bjnano.15.49

• Clara, USA). The magnetic properties were evaluated on a Quantum Design PPMS-9T vibrating magnetometer at 300 K in a magnetic field from −3.0 T to 3.0 T (PPMS-9T, Quantum Design, San Diego, USA). Longitudinal (T1) and transversal (T2) relaxation times were measured on a 3.0 T MR scanner (MAGNETOM Skyra

Photocatalytic degradation of methylene blue under visible light by cobalt ferrite nanoparticles/graphene quantum dots

• Vo Chau Ngoc Anh,
• Le Thi Thanh Nhi,
• Le Thi Kim Dung,
• Dang Thi Ngoc Hoa,
• Nguyen Truong Son,
• Nguyen Thi Thao Uyen,
• Nguyen Ngoc Uyen Thu,
• Le Van Thanh Son,
• Le Trung Hieu,
• Tran Ngoc Tuyen and
• Dinh Quang Khieu

Beilstein J. Nanotechnol. 2024, 15, 475–489, doi:10.3762/bjnano.15.43

• degradation of methylene blue (MB) under visible light. The catalyst can be recycled with an external magnetic field and displays suitable stability. Also, it was reused in three successive experiments with a loss of efficiency of about 5%. The CF/GQDs are considered as an efficient photocatalyst for MB

• temperature. They are much smaller than the bulk value (65.8 emu/g). The decrease in the saturation magnetization of the CF/GQDs is attributed to the presence of the nonmagnetic GQDs. The particles’ high magnetic permeability shows that they could be separated with an external magnetic field. The Mr values of

• , oxalates, and sulfates, Scheme 1). Finally, MB could be mineralized to CO2, H2O, and [38]. In order to check the stability of the materials, the prepared CF/GQDs-200 catalysts were reused in three cycles (Figure 9b). After each run, the catalyst was separated with an external magnetic field. It was found

Superconducting spin valve effect in Co/Pb/Co heterostructures with insulating interlayers

• Andrey A. Kamashev,
• Nadir N. Garif’yanov,
• Aidar A. Validov,
• Vladislav Kataev,
• Alexander S. Osin,
• Yakov V. Fominov and
• Ilgiz A. Garifullin

Beilstein J. Nanotechnol. 2024, 15, 457–464, doi:10.3762/bjnano.15.41

• an in-plane external magnetic field strength of ≈ 1.5 kOe. Magnetic studies of the samples are presented in Supporting Information File 1. We took the same thickness of 3 nm for both Co1 and Co2 layers. In addition, a control set of the samples with similar thicknesses of the S and F layers but

• out with a standard four-point method in the DC mode. For changing the mutual direction of the magnetization of the F layers between the P and AP orientations, an external magnetic field of ≈1 kOe < was always applied in the plane of the sample in all measurements. The strength of the magnetic field

• defined as the midpoint of the transition curve. To study the SSV effect, the samples were cooled down from room temperature to low temperatures in a magnetic field of the order of 5 kOe (field cooling procedure) applied in the sample plane. This field aligns the magnetization of both F layers. Also, the

Modulated critical currents of spin-transfer torque-induced resistance changes in NiCu/Cu multilayered nanowires

• Mengqi Fu,
• Roman Hartmann,
• Julian Braun,
• Sergej Andreev,
• Torsten Pietsch and
• Elke Scheer

Beilstein J. Nanotechnol. 2024, 15, 360–366, doi:10.3762/bjnano.15.32

• oscillatory manner by the magnetic field in the nanowire-based devices. We present a toy model to qualitatively explain these observations. Keywords: AAO template; critical current; multilayered magnetic nanowires; spin-transfer torque; three-dimensional devices; Introduction Spin-transfer torque (STT) has

• a nonmonotonic dependence between the critical current of STT-assisted resistance changes and the strength of the external magnetic field in NiCu/Cu multilayered nanowire devices with arbitrary sequence of magnetic and nonmagnetic sections along the long axis of the nanowires. The STT devices were

• mV) added to a DC bias voltage at a frequency of 4531 Hz. A four-point measurement was used to exclude the effects of the cabling. A positive current is defined such that the electrons flow from the top electrode to the bottom electrode. A magnetic field was applied perpendicular to the nanowires

Vinorelbine-loaded multifunctional magnetic nanoparticles as anticancer drug delivery systems: synthesis, characterization, and in vitro release study

• Zeynep Özcan and
• Afife Binnaz Hazar Yoruç

Beilstein J. Nanotechnol. 2024, 15, 256–269, doi:10.3762/bjnano.15.24

• external magnetic field. This finding is crucial for future studies on magnetic field-guided drug release and tumour treatment. Particularly, our research also investigates the effect of varying polymer ratios on drug release kinetics and photothermal efficiency, which was not addressed in the

• multifunctional PEGylated magnetic nanoparticles coated with polydopamine (PDA) exhibit strong near-infrared absorption because of the PDA layer and have the ability to deliver drugs under a magnetic field owing to their superparamagnetism [51]. During the drug loading studies, the anticancer drug vinorelbine was

• nanoparticles [49]. Based on the findings from VSM, the nanoparticles exhibit high magnetization [49][54]. The magnetic properties of VNB/PDA/Fe3O4 NPs can be attributed to the structural arrangement of Fe3O4 within the nanoparticles. A magnetic field can enhance the dispersion of VNB/PDA/Fe3O4 NPs in an

Modification of graphene oxide and its effect on properties of natural rubber/graphene oxide nanocomposites

• Nghiem Thi Thuong,
• Le Dinh Quang,
• Vu Quoc Cuong,
• Cao Hong Ha,
• Nguyen Ba Lam and
• Seiichi Kawahara

Beilstein J. Nanotechnol. 2024, 15, 168–179, doi:10.3762/bjnano.15.16

• with the diffraction angle (2-theta) ranging from 5 to 80°. Solid-state 29Si NMR spectra were recorded with a JNM ECA-400 (JEOL, Japan) spectrometer operating at a magnetic field of 400 MHz. A suitable amount of rubber sample was inserted in an NMR tube and injected into an NMR system equipped with a

Ferromagnetic resonance spectra of linear magnetosome chains

• Elizaveta M. Gubanova and
• Nikolai A. Usov

Beilstein J. Nanotechnol. 2024, 15, 157–167, doi:10.3762/bjnano.15.15

• produce elongated magnetite nanoparticles [1][2][10][11]. A linear chain of uniformly magnetized magnetosomes grown inside a magnetotactic bacterium is a kind of magnetic needle that helps the bacterium navigate in the weak Earth's magnetic field in search of the best habitat [1][2][3][4]. Chains of

• of magnetic nanoparticle assemblies are often characterized by measuring ferromagnetic resonance (FMR) spectra [14][15]. The analysis of FMR spectra makes it possible to determine the effective magnetic field in the sample under study, which depends on the particle saturation magnetization, the type

• [22][23][24][25], in which the behavior of a magnetosome chain in an alternating (ac) high-frequency magnetic field is replaced by the behavior of a uniformly magnetized ellipsoid with an appropriately selected demagnetizing factor. As a result, important information about the internal geometry of the

Measurements of dichroic bow-tie antenna arrays with integrated cold-electron bolometers using YBCO oscillators

• Leonid S. Revin,
• Dmitry A. Pimanov,
• Alexander V. Chiginev,
• Anton V. Blagodatkin,
• Viktor O. Zbrozhek,
• Andrey V. Samartsev,
• Anastasia N. Orlova,
• Dmitry V. Masterov,
• Alexey E. Parafin,
• Victoria Yu. Safonova,
• Anna V. Gordeeva,
• Andrey L. Pankratov,
• Leonid S. Kuzmin,
• Anatolie S. Sidorenko,
• Silvia Masi and
• Paolo de Bernardis

Beilstein J. Nanotechnol. 2024, 15, 26–36, doi:10.3762/bjnano.15.3

• –frequency characteristics of resonant bolometers was set up as follows: The generator chip with JJs was mounted on the sample holder with a 4 mm Si hyperhemispherical lens thermally coupled with a 2.7 K cryostat plate. The control magnetic field required to create a flux-flow regime in a long Josephson

TEM sample preparation of lithographically patterned permalloy nanostructures on silicon nitride membranes

• Joshua Williams,
• Michael I. Faley,
• Joseph Vimal Vas,
• Peng-Han Lu and
• Rafal E. Dunin-Borkowski

Beilstein J. Nanotechnol. 2024, 15, 1–12, doi:10.3762/bjnano.15.1

• structure. The microscope is operated in a magnetic-field-free mode. In this case, the objective lens is turned off, and the Lorentz lens is used instead to focus the electron beam onto the back focal plane. As the electron beam passes through the sample, the in-plane sample magnetization exerts a Lorentz

• force onto the electron beam, which deflects the beam. The force on each electron in the beam is given by where F is the force, e is the charge, v is the relativistic velocity of the electron beam, and B is the magnetic field exerted by the sample. In the case of a vortex structure, the electron beam is

• external magnetic field applied using the objective lens was first studied using Lorentz TEM. The initial magnetic configuration of the Py nanodisks after relaxation is shown in Figure 13c. In order to ascertain the coercive field of the sample, we applied the external field until the contrast was no

A bifunctional superconducting cell as flux qubit and neuron

• Dmitrii S. Pashin,
• Pavel V. Pikunov,
• Marina V. Bastrakova,
• Andrey E. Schegolev,
• Nikolay V. Klenov and
• Igor I. Soloviev

Beilstein J. Nanotechnol. 2023, 14, 1116–1126, doi:10.3762/bjnano.14.92

• how the proposed adjustment circuit will operate at finite (millikelvin) temperatures in the quantum regime and under the influence of relatively fast magnetic field control pulses? Will the tuning, coupling, and neromorphic co-processing circuits acquire new useful properties in the quantum regime

Nanoarchitectonics of photothermal materials to enhance the sensitivity of lateral flow assays

• Elangovan Sarathkumar,
• Rajasekharan S. Anjana and
• Ramapurath S. Jayasree

Beilstein J. Nanotechnol. 2023, 14, 988–1003, doi:10.3762/bjnano.14.82

• , iron oxide nanoparticles are the most prominent ones because of their biocompatibility, low toxicity, ease of synthesis, and high photothermal conversion efficiency. The influence of a magnetic field can also increase temperature generation by such nanoparticles, which is called magnetic hyperthermia

• nanocomposite was used for the preconcentration of antigen in the sample using a magnetic field and Au was used as a photothermal signal amplification probe. This method enabled the quantitative determination of OTA using a portable thermal camera with a limit of detection (LOD) of 0.12 pg·mL−1 [81]. Graphene

Green SPIONs as a novel highly selective treatment for leishmaniasis: an in vitro study against Leishmania amazonensis intracellular amastigotes

• Brunno R. F. Verçoza,
• Robson R. Bernardo,
• Luiz Augusto S. de Oliveira and
• Juliany C. F. Rodrigues

Beilstein J. Nanotechnol. 2023, 14, 893–903, doi:10.3762/bjnano.14.73

• , the ability for magnetic manipulation, the possibility of being used in magnetic resonance imaging, and the ability to generate controlled heat non-invasively when exposed to an alternating magnetic field [7][8]. In 2019, our group published an article describing a low-cost green synthesis of SPIONs

Investigations on the optical forces from three mainstream optical resonances in all-dielectric nanostructure arrays

• Guangdong Wang and
• Zhanghua Han

Beilstein J. Nanotechnol. 2023, 14, 674–682, doi:10.3762/bjnano.14.53

• perpendicular to and pointing toward the outside of the surface, and ⟨Tij⟩ is the time-averaged MST [18] defined by where the indices i and j denote x, y, or z components of the electric or magnetic field; εr and μr are the relative permittivity and the relative permeability of the surrounding medium

• -factor of 175. The electric and magnetic field amplitude distributions at the resonance wavelength are plotted in Figure 2b, where the white arrows represent the electric displacement current vectors. It is seen that the electromagnetic field is well confined within the silicon disk. Although the optical

• and sharp optical resonance with also an asymmetric Fano profile is found located near 1990.63 nm with a Q-factor of about 2.5 × 105. Figure 4b presents the electric and magnetic field distributions at the resonance, where the white arrows still represent the electric displacement current vectors. The

Metal-organic framework-based nanomaterials as opto-electrochemical sensors for the detection of antibiotics and hormones: A review

• Akeem Adeyemi Oladipo,
• Saba Derakhshan Oskouei and
• Mustafa Gazi

Beilstein J. Nanotechnol. 2023, 14, 631–673, doi:10.3762/bjnano.14.52

Observation of multiple bulk bound states in the continuum modes in a photonic crystal cavity

• Rui Chen,
• Yi Zheng,
• Xingyu Huang,
• Qiaoling Lin,
• Chaochao Ye,
• Meng Xiong,
• Martijn Wubs,
• Yungui Ma,
• Minhao Pu and
• Sanshui Xiao

Beilstein J. Nanotechnol. 2023, 14, 544–551, doi:10.3762/bjnano.14.45

• modes localized near (pπ/Leff, qπ/Leff) in the first quadrant. The locations in momentum space and the magnetic field (H field) distributions of several of the lowest-order Mpq modes are drawn in Figure 2c and Figure 2d, respectively. The mode indices and eigenwavelengths are marked in each mode pattern